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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bac00ce691b6e9611fe42e4328c88487c685c2a6882dde1a9fd6eee40d43186' 
  AND token = 'bc5Zt3qR4dNR8mp2anDxFjfjPRuThlAyT2fNsq5UobA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}